Lake Buena Vista is a city in Orange County, Florida, United States. It is mostly known for being the mailing address for the Walt Disney World—although almost all of the resort facilities, including all four theme parks, are physically located in the adjacent city of Bay Lake. It is one of two Florida municipalities controlled by The Walt Disney Company, the other being Bay Lake. The permanent residential population of Lake Buena Vista was 10 at the 2010 census.